import java.sql.*;

public class Hello {
    public static void main(String[] args) {

        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;


        try {
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.创建连接
            String url = "jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            connection = DriverManager.getConnection(url, "root", "root");
            //if(connection != null) {
               // System.out.println("连接成功");
            //}
            String sql = "select * from user";

            preparedStatement = connection.prepareStatement(sql);

            resultSet = preparedStatement.executeQuery();

            while(resultSet.next()) {
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);

                System.out.println(id + "----" + name + "----" + pass);

            }









        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {

            try {
                if(resultSet != null) {
                    resultSet.close();
                }
                if(preparedStatement != null) {
                    preparedStatement.close();
                }
                if(connection != null) {
                    connection.close();
                }

            } catch (SQLException e) {
                throw new RuntimeException(e);
            }


        }


    }
}
